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Search Results: 1 - 10 of 20171 matches for " Gang Pan "
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Analysis of Microsatellite DNA Markers Reveals no Genetic Differentiation between Wild and Hatchery Populations of Pacific Threadfin in Hawaii
Gang Pan, Jinzeng Yang
International Journal of Biological Sciences , 2010,
Abstract: Pacific threadfin, Polydactylus sexfilis, is popular fish in recreational fishing, as well as aquaculture in Hawaii. Its natural population has been continuously declining in the past several decades. Microsatellite DNA markers are useful DNA-based tool for monitoring Pacific threadfin populations. In this study, fifteen Microsatellite (MS) DNA markers were identified from a partial genomic Pacific threadfin DNA library enriched in CA repeats, and six highly-polymorphic microsatellite loci were employed to analyze genetic similarity and differences between the wild population and hatchery population in Oahu Island. A total of 37 alleles were detected at the six MS loci in the two populations. Statistical analysis of fixation index (FST) and analysis of molecular variance (AMOVA) showed no genetic differentiation between the wild and hatchery populations (FST=0.001, CI95%= -0.01-0.021). Both high genetic diversity (Ho=0.664-0.674 and He=0.710-0.715) and Hardy-Weinberg equilibrium were observed in the wild and hatchery populations. Results of genetic bottleneck analysis indicated that the hatchery was founded with sufficient numbers of brooders as inbreeding coefficient is very low (FIS=0.052-0.072) in both wild and hatchery populations. Further studies are needed for comprehensive determinations of genetic varieties of primary founder broodstocks and successive offspring of the hatchery and wild populations with increased number of Pacific threadfin sample collections.
Fault Ride-Through Capability Enhancement of PV System with Voltage Support Control Strategy  [PDF]
Dehui Zeng, Gang Wang, Guoqing Pan, Haifeng Li
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.32B006
Abstract: With continuously increasing of photovoltaic (PV) plant’s penetration, it has become a critical issue to improve the fault ride-through capability of PV plant. This paper refers to the German grid code, and the PV system is controlled to keep grid connected, as well as inject reactive current to grid when fault occurs. The mathematical model of PV system is established and the fault characteristic is studied with respect to the control strategy. By analyzing the effect of reactive power supplied by the PV system to the point of common coupling (PCC) voltage, this paper proposes an adaptive voltage support control strategy to enhance the fault ride-through capability of PV system. The control strategy fully utilizes the PV system’s capability of voltage support and takes the safety of equipment into account as well. At last, the proposed control strategy is verified by simulation.
Photocatalytic degradation pathways and adsorption modes of H-acid in TiO2 suspensions
Gang Pan,Dan Wang,YuanYuan Liu
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-011-4894-0
Abstract: Effect of adsorption mode on photodegradation of H-acid in TiO2 suspension was studied using DFT calculation, UV-Vis spectroscopy, FTIR, and ionic chromatography. At pH 2.5, H-acid was adsorbed on TiO2 surfaces by one dissociated sulfonic group. The adsorbed sulfonic group was attacked by surface ·OH, resulting in the production of SO4 2 and the cleavage of the naphthalene ring. At pH 5.0, H-acid was adsorbed on TiO2 surfaces by two sulfonic groups. The two adsorbed sulfonic groups were simultaneously attacked by surface ·OH, leading to a faster initial production of SO4 2 and initial degradation rate of H-acid than those under pH 2.5. Microscopic adsorption structures may be more important than adsorption amount in controlling the photodegradation pathways of organic pollutants.
Microbial biodegradation of microcystin-RR by bacterium Sphingopyxis sp. USTB-05

Mulan Zhang,Gang Pan,Hai Yan,

环境科学学报(英文版) , 2010,
Abstract: A strain,USTB-05,isolated from Lake Dianchi,China,degraded the cyanobacterial toxin microcystin-RR(MC-RR) at the rate of 16.7 mg/L per day.Analysis of 16S rDNA sequence showed that the strain was Sphingopyxis sp.Enzymatic degradation pathways for MC-RR by Sphingopyxis sp.USTB-05 were identified.Adda-Arg peptide bond of MC-RR was cleaved and then a hydrogen and a hydroxyl were combined onto the NH 2 group of Adda and the carboxyl group of arginine to form a linear molecule as intermediate product within the ...
Effect of temperature on the sorption and desorption of perfluorooctane sulfonate on humic acid

Chengxia Jia,Chun You,Gang Pan,

环境科学学报(英文版) , 2010,
Abstract: Sorption and desorption of perfluorooctane sulfonate (PFOS) on humic acid at different temperatures were studied. It was found that the sorption process could be modeled with power kinetic equation very well, suggesting that diffusion predominated the sorption of PFOS on the humic acid. The sorption capacity was doubled when the temperature increased from 5 to 35℃, and thermodynamics parameters △G~0 was calculated to be -7.11 to -5.04 kJ/mol, △H~0 was 14.2 kJ/mol, and △S~0 was 69.5 J/(mol·K), indicating that the sorption was a spontaneous, endothermic, and entropy driven process. Desorption hysteresis occurred at all studied temperatures which suggested that humic acid may be an important sink of PFOS in the environment.
Temperature Prediction of Hydrogen Producing Reactor Using SVM Regression with PSO
Minqiang Pan,Dehuai Zeng,Gang Xu
Journal of Computers , 2010, DOI: 10.4304/jcp.5.3.388-393
Abstract: Temperature forecasting of hydrogen-producing reactor is a complicated problem due to its nonlinearity and the small quantity of training data. Support vector machine (SVM) has been successfully employed to solve regression problem of nonlinearity and small sample. The determination for hyper-parameters including kernel parameters and the regularization is important to the performance of SVM. Particle Swarm Optimization (PSO) is a method for finding a solution of stochastic global optimizer based on swarm intelligence. Using the interaction of particles, PSO searches the solution space intelligently and finds out the best one. Thus, the proposed forecasting model based on the global optimization of PSO and local accurate searching of SVM is applied to forecast hydrogen-producing reactor temperature in this paper. Practical example results indicate that the application of the PSO-SVM method to temperature forecasting of hydrogen-producing reactor is feasible and effective. And to prove the effectiveness of the model, other existing methods are used to compare with the result of SVM. The results show that the model is effective and highly accurate in the forecasting of hydrogen-producing reactor temperature.
Experimental study on combustion characteristics of municipal solid waste
JIANG Fan,LIU Shi,WANG Hai-Gang,Pan Zhong-gang,
,LIU Shi,WANG Hai-gang,PAN Zhong-gang

环境科学学报(英文版) , 2003,
Abstract: As incineration provides a relatively safe means of disposal, significant reduction of weight and volume, and energy recovery from the waste, it was adopted by many countries. For the experimental investigation on the combustion characteristics of municipal solid waste(MSW), a lab scale fluidized bed facility was constructed. Many kinds of combustion runs were conducted in this fluidized bed combustion facility. The examined parameters were bed temperature(773 to 1143K), form of fuels (scrap or whole), moisture of fuels and so on. Concentration of CO 2,CO,SO 2, O 2 and NOx in the flue gas were monitored and recorded every 5 seconds. The temperatures along the reactor are recorded every 10 seconds. Experimental results were given and analyzed.
Immobilization of arsenic in soils by stabilized nanoscale zero-valent iron, iron sulfide (FeS), and magnetite (Fe3O4) particles
MeiYi Zhang,Yu Wang,DongYe Zhao,Gang Pan
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0703-4
Abstract: Arsenic is a widespread contaminant in soils and groundwater. While various iron-based materials have been studied for immobilizing arsenic in contaminated soils, the feasibility of stabilized iron-based nanoparticles has not been reported. This study investigates the effectiveness of using three types of starch-stabilized iron-based nanoparticles, including zero-valent iron (ZVI), iron sulfide (FeS), and magnetite (Fe3O4), for immobilization of arsenic in two representative As-contaminated soils (an orchard soil and a fire range soil). To test the effect of the nanoparticles on the arsenic leachability, As-contaminated soils were amended with the nanoparticles at various Fe/As molar ratios (5:1–100:1) and contact time (3 and 7 d). After three days’ treatments of a field-contaminated sandy soil, the PBET-based bioaccessibility of As decreased from an initial (71.3±3.1)% (mean±SD) to (30.9±3.2)% with ZVI, (37.6±1.2)% with FeS, and (29.8± 3.1)% with Fe3O4 at an Fe/As molar ratio of 100:1. The TCLP-based leachability of arsenic in a spiked fire range soil decreased from an initial (0.51±0.11)% to (0.24±0.03)%, (0.27±0.04)% and (0.17±0.04)% by ZVI, FeS, and Fe3O4 nanoparticles, respectively. The Fe3O4 nanoparticles appeared to be more effective (5% or more) than other nanoparticles for immobilizing arsenic. When the two soils were compared, the treatment is more effective on the orchard soil that has a lower iron content and higher initial leachability than on the range soil that already has a high iron content. These results suggest that these innocuous iron-based nanoparticles may serve as effective media for immobilization of As in iron-deficient soils, sediments or solid wastes.
Effective removal of microcystins using carbon nanotubes embedded with bacteria
Hai Yan,Gang Pan,Hua Zou,Xianliang Li,Hao Chen
Chinese Science Bulletin , 2004, DOI: 10.1007/BF03184300
Abstract: Adsorption of microcystins (MCs) by carbon nanotubes (CNTs) and clay materials was studied. Compared with various clays tested, CNTs showed a much stronger ability to adsorb MC-RR and LR that were two typical types of microcystins found in China. At initial 21.0 mg/L of MC-RR and 9.5 mg/L of MC-LR in solution, the adsorption amounts of MC-RR and LR by CNTs were 14.8 and 6.7 mg/g that were about five times higher than those by the clay materials of sepiolite, kaolinite and talc, etc. In the presence of CNTs and the bacterialRalstonia solanacearum that was firstly isolated and used for the biodegradation of MCs by the authors, a remarkable removal of MCs from water were observed. The mechanism was that CNTs could absorb large amount of both MCs and the embeddedR. solanacearum so that, even when diluted by a large amount of water, the concentrations of both organic pollutants and the added bacteria could be largely enhanced on the surface of CNTs where a concerted biodegradation reaction was effectively conducted. This finding could be important for the further development of practical techniques to eliminate MCs from polluted drinking waters.
广义 Liénard 方程的整体渐近性态


系统科学与数学 , 1992,
Abstract: In this paper,the global asymptotic behavior of the generalized Liénard equa-tion \dot{x}+f(x)\dot{x}+g(x)=e(x),where e(t) is absolutely integrable is studied.Necessary and sufficient conditions for all solutions and their derivatives to convergeto zero are provided.
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